Hello all new to this site and new to owning a rhino. The noise is really noticeable while going down steep hills while pressing on the the brakes. My rhino is a 2007 660 with 800 miles on it. I was hoping it was just the brakes were worn out but checked all of them and are like new. Not sure if someone else has had this problem. Also could it be something with the clutch maybe or maybe just really glazed brake pads.
Its a bad design . my 660 rear brake was always dragging and making that horrible sound.They put it on the drive shaft and made it a rear brake/ parking brake. I went through pads so fast i took it off. The newer ones i have are disk on all 4 plus the e brake on driveshaft . Its just something you will have to deal with or take off.
The stock brake pads will "glaze" especially if the unit was driven with the parking brake on. Take off the pads and sand them with 60 grit sandpaper and in my case it stopped the noise doing the same as you describe.
I recently ran into the same issue. I checked the pads also and all seemed well until I disassembled the rear brakes. The pad was completely worn off and it was metal on metal. Replaced with some cheap pads off eBay for like 8 bucks and its all good now.